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<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>4.join和split</title>
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<body>

  <script>
    // split拆分
    const arr = '1-2-3'.split('-')
    console.log(arr);
    // join链接
    console.log(arr.join('+'));
  </script>
  
</body>
</html>